Add subagents for discussion, document generation, and code exploration

- Introduced Discuss Subagent for lightweight multi-perspective critique, reducing overhead from ~60-90s to ~5s.
- Added Doc Generation Subagent for generating documents with CLI analysis and template filling.
- Implemented Explore Subagent for centralized codebase exploration with caching, replacing the standalone explorer role.
- Created templates for architecture documents, epics, product briefs, and requirements PRD to standardize outputs.
- Added a review file for tracking changes and discussions.

.claude/skills/team-lifecycle/role-specs/tester.md

@@ -0,0 +1,76 @@
+---
+role: tester
+prefix: TEST
+inner_loop: false
+discuss_rounds: []
+subagents: []
+message_types:
+  success: test_result
+  fix: fix_required
+  error: error
+---
+
+# Tester — Phase 2-4
+
+## Phase 2: Framework Detection & Test Discovery
+
+**Framework detection** (priority order):
+
+| Priority | Method | Frameworks |
+|----------|--------|-----------|
+| 1 | package.json devDependencies | vitest, jest, mocha, pytest |
+| 2 | package.json scripts.test | vitest, jest, mocha, pytest |
+| 3 | Config files | vitest.config.*, jest.config.*, pytest.ini |
+
+**Affected test discovery** from executor's modified files:
+- Search variants: `<name>.test.ts`, `<name>.spec.ts`, `tests/<name>.test.ts`, `__tests__/<name>.test.ts`
+
+## Phase 3: Test Execution & Fix Cycle
+
+**Config**: MAX_ITERATIONS=10, PASS_RATE_TARGET=95%, AFFECTED_TESTS_FIRST=true
+
+1. Run affected tests → parse results
+2. Pass rate met → run full suite
+3. Failures → select strategy → fix → re-run → repeat
+
+**Strategy selection**:
+
+| Condition | Strategy | Behavior |
+|-----------|----------|----------|
+| Iteration <= 3 or pass >= 80% | Conservative | Fix one critical failure at a time |
+| Critical failures < 5 | Surgical | Fix specific pattern everywhere |
+| Pass < 50% or iteration > 7 | Aggressive | Fix all failures in batch |
+
+**Test commands**:
+
+| Framework | Affected | Full Suite |
+|-----------|---------|------------|
+| vitest | `vitest run <files>` | `vitest run` |
+| jest | `jest <files> --no-coverage` | `jest --no-coverage` |
+| pytest | `pytest <files> -v` | `pytest -v` |
+
+## Phase 4: Result Analysis
+
+**Failure classification**:
+
+| Severity | Patterns |
+|----------|----------|
+| Critical | SyntaxError, cannot find module, undefined |
+| High | Assertion failures, toBe/toEqual |
+| Medium | Timeout, async errors |
+| Low | Warnings, deprecations |
+
+**Report routing**:
+
+| Condition | Type |
+|-----------|------|
+| Pass rate >= target | test_result (success) |
+| Pass rate < target after max iterations | fix_required |
+
+## Error Handling
+
+| Scenario | Resolution |
+|----------|------------|
+| Framework not detected | Prompt user |
+| No tests found | Report to coordinator |
+| Infinite fix loop | Abort after MAX_ITERATIONS |